JP2539532B2 - Control method of vacuum cleaner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for controlling an electric vacuum cleaner, and more particularly to a method for manufacturing an electric vacuum cleaner that automatically controls a fan motor or a nozzle motor according to a surface to be cleaned. It is a thing.

[Conventional technology]

The conventional vacuum cleaner detects what the surface to be cleaned is based on the change in the current flowing through the nozzle motor provided in the suction port as described in JP-A-64-52430, and based on the result, the fan is detected. It controls the motor input.

[Problems to be Solved by the Invention]

In the above-mentioned prior art, for example, when the surface to be cleaned is a fold, the change in the current of the nozzle motor is different when the suction body is operated in parallel to the direction in which the folds of the fold surface are arranged and when operated orthogonally. The point is not taken into consideration, and the method of detecting the surface to be cleaned from the mere change in the current of the nozzle motor causes a problem that the surface to be cleaned is erroneously judged.

Then, the objective of this invention is providing the control method of the electric vacuum cleaner which can automatically obtain the optimal suction force according to the to-be-cleaned surface.

[Means for solving the problem]

In order to achieve the above-mentioned object, a feature of the present invention is that a cleaner main body including a dust collecting filter and a fan motor that generates an intake air flow, a hose connected to the cleaner main body, and a hose An electric vacuum cleaner comprising: a suction body connected via an extension pipe, the suction body having a rotary cleaning body for scraping up dust on a cleaning surface, and a nozzle motor for driving the rotary cleaning body. A detection means for detecting a current flowing through the nozzle motor, and a control device for controlling the fan motor based on the detection means, wherein the control device contacts the suction body with a surface to be cleaned in a front-back direction. Calculating the average value of the current value flowing in the nozzle motor and the fluctuation range of the current value from the detection value of the detection means when operated to
It is to control the rotation speed of the fan motor based on the calculation result.

Further, a feature of the present invention is that a cleaner body containing a dust collecting filter and a fan motor for generating an intake air flow, a hose connected to the cleaner body, and an extension pipe to the hose. An electric vacuum cleaner comprising: a suction body connected to the suction body; a rotary cleaning body that scrapes up dust on a cleaning surface; and a nozzle motor that drives the rotary cleaning body. It has a detection means for detecting a flowing current and a control device for controlling the fan motor and the nozzle motor based on the detection means, and the control device contacts the suction body with a surface to be cleaned in a front-back direction. The average value of the current value flowing in the nozzle motor and the fluctuation range of the current value are calculated from the detection value of the detection means when operated, and the rotation speeds of the fan motor and the nozzle motor are calculated based on the calculation result. Lies in the fact that Gosuru.

Further, in addition to the above-mentioned first and second means, a feature of the present invention is to have second detecting means for detecting a current flowing through the fan motor, and the control device is provided with the second detecting means.
The degree of clogging of the dust collecting filter is calculated from the detection value of the detecting means, and the rotation speed of the fan motor is corrected based on the calculation result.

[Action]

According to the present invention, the rotation speed of the fan motor (and the nozzle motor) is controlled by determining the type of the surface to be cleaned from the average value of the current values flowing in the nozzle motor and the fluctuation range of the current values. It is possible to obtain the optimum suction force according to the surface to be cleaned.

Further, according to the present invention, the degree of clogging of the dust collecting filter is judged from the value of the current flowing through the fan motor to correct the rotation speed of the fan motor (and the nozzle motor), so It is possible to obtain the optimum suction force according to the surface to be cleaned, regardless of the degree of clogging.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In the present invention, it is premised that a variable speed motor is used as a fan motor as a drive source of the vacuum cleaner. Variable speed motors include AC commutator motors whose speed changes by controlling the input, phase control motors, induction motors driven by inverters, reactance motors,
Alternatively, a brushless motor or the like may be considered, but in the present embodiment, a brushless motor that does not have a brush accompanied by mechanical sliding and therefore has a long life and good control response is used as a fan motor. explain.

Further, in the present invention, it is premised that the nozzle has a nozzle motor for driving a rotary brush, and the nozzle motor may be a DC magnet motor or an AC commutator motor. In this embodiment, however, a DC magnet with a built-in rectifier circuit is used. An example using a motor will be described.

FIG. 1 is a block diagram showing a schematic configuration of the control circuit, and FIG.
The figure is an overall configuration diagram of the control circuit.

In the figure, 16 indicates an inverter control device.
29 is an AC power supply, which is rectified by the rectification circuit 21 and smoothed by the capacitor 22 and is supplied to the inverter circuit 20 with a DC voltage E _d.
Is to supply. The inverter circuit 20 includes transistors TR _{1 to} TR ₆ and rectifier diodes D _{1 to} D ₆ connected in parallel to the respective transistors TR _{1 to} TR ₆ 12
It is a 0-degree energizing inverter. Transistor TR _1- TR
₃ constitutes a positive arm, and transistors TR _{4 to} TR ₆ constitute a negative arm.
Is pulse width modulated (PWM). R ₁ is the capacitor side and the emitter side of transistors TR ₄ to TR ₆ that form the negative arm.
It is a relatively low resistance connected between the negative side of 22.

The FM is a brushless motor (hereinafter referred to as a brushless fan motor) which is a fan motor, and has a rotor R composed of two-pole permanent magnets and armature windings U, V, W. The load current _ID flowing through these windings U, V, W can be detected as a voltage drop across the resistor R ₁ . The speed control circuit of the brushless fan motor FM includes a magnetic pole position detection circuit 18 that detects the magnetic pole position of the rotor R with the Hall element 17, etc., an amplifier 23 that amplifies the detection value of the load current _ID described above, and the transistors TR ₁ to TR ₁ . TR ₆
And a micro-computer 19 for driving the base driver 15 based on the detection signal 18S obtained from the circuit 18. 30
Is a driving switch operated by an actual user.

On the other hand, 26 is a nozzle motor that drives a rotary brush provided on the suction side of the cleaner, and power is supplied by controlling the phase of the AC power supply 29 with a triac (FLS) 25. 24 ignition circuit of Toraiatsuku 25, 27 is a current detector of the load current I _N flowing through the nozzle motor 26, 28 is an amplifier of the output signal of the current detector 27.

The magnetic pole position detection circuit 18 receives a signal from the Hall element 17 and generates a magnetic pole position signal 18S of the rotor R. The magnetic pole position signal 18S is used not only for switching the current of the armature windings U, V, W, but also as a signal for detecting the rotation speed. The microcomputer 19 obtains the velocity by counting the number of the magnetic pole position signals 18S within a fixed sampling.

Brushless fan motor FM load current I _D amplifier 23
Is a peak-hold circuit (not shown) for the voltage drop across resistor R _1.
Is converted into a direct current component via and amplified to obtain a load current I _D of the brushless fan motor FM.

Load current amplifier 28 for I _N of the nozzle motor (a built-in rectifier circuit) 26, the output signal of the current detection value 27 is an AC to be rectified into a DC component and amplifies the nozzle it is intended to obtain a load current I _N of the motor 26.

The micro computer 19 is a central processing unit (CPU) 19-1, read only memory (ROM).
19-2, and random access memory (RAM) 19-3
Although not shown, these are connected to each other by an address bus, a data bus, a control bus, and the like. Then, in the ROM-19-2, a program necessary to drive the brushless fan motor FM, for example, speed calculation processing, operation command acquisition processing, speed control processing (ASR), current control processing (ACR), A nozzle motor current detection process, a fan motor current detection process, and the like are stored, and a function table 8 in which arbitrary and various speed control patterns are stored is provided.

On the other hand, the RAM 19-3 is used for reading and writing various external data necessary for executing various programs stored in the ROM 19-2.

The transistors TR _{1 to} TR ₆ are connected to the base driver 1 according to the ignition signal 19S processed and generated by the microcomputer 19.
Driven by 5 respectively.

The triac 25 is driven by a firing circuit 24 in response to a firing signal 19D that is also processed and generated by the microcomputer 19.

In this type of brushless fan motor FM, the current flowing through the armature winding corresponds to the output torque of the motor, and conversely, the output torque can be made variable by changing the applied current. That is, the output torque of the motor can be continuously and arbitrarily changed by adjusting the applied current. Further, the rotation speed of the brushless fan motor FM can be freely changed by changing the drive frequency of the inverter.

The electric vacuum cleaner of the present invention uses such a brushless fan motor.

Next, FIG. 3 shows the entire structure of the vacuum cleaner, and FIG. 4 shows the internal structure of the suction body.

In FIGS. 3 and 4, 1 is a surface to be cleaned, 2 is a cleaner body, 3 is a hose, 4 is a hand switch part, 5 is an extension pipe, 6
Is a suction body with a built-in rotary brush. Inside the suction case 7 of the suction body 6, the nozzle motor 26, the rotary brush 1
0, there is a brush 11 attached to it. Reference numeral 12 is a belt for transmitting the driving force of the nozzle motor 26 to the rotary brush 10, 13 is a suction extension tube, and 14 is a roller. The power supply lead wire 9 of the nozzle motor 26 is connected to the power supply wire 5A provided in the extension tube 5.

As a result, when the nozzle motor 26 is supplied with power and rotates, the rotary brush 10 rotates via the belt 12. When the rotary brush 10 is rotating, the suction port 6 is attached to the surface to be cleaned 1
When the brush 11 is brought into contact with the rotary brush 10, since the brush 11 has the brush 11, the brush 11 contacts the surface 1 to be cleaned, and the nozzle motor 26
The load current I _{N of} becomes large. By the way, as a result of various experiments, since the nozzle motor 26 rotates in one direction, the rotary brush 10 also rotates in one direction, and when the suction port 6 is operated back and forth, when the rotary brush 10 is rotated, the suction port 6 advances in the direction in which the suction port 6 advances. It has been found that the load current I _N of the nozzle motor 26 is reduced when is operated, and the load current I _N of the nozzle motor 26 is increased when the suction port 6 is operated in the opposite direction.

Therefore, a method of determining (estimating) the surface to be cleaned using the change in the load current of the nozzle motor will be described next.

First, FIG. 5 shows voltage and current waveforms applied to the nozzle motor.

In FIG. 5 (a), the voltage in the figure is applied to the nozzle motor 26.
If V _S is applied, the nozzle motor 26 is a DC mug the net motor with a rectifier circuit (not shown), current flows I _N that intermittently poor power factor of the illustrated. In contrast, in FIG. 5 (b), the nozzle motor current I _N1 showing a suction port 6 by a solid line when not in contact with the surface being cleaned 1, a chain line when contacting the mouthpiece 6 to the cleaning surface 1 Comparing with the nozzle motor current 1 _N2 indicated by, the peak value of the nozzle motor current changes greatly, and the deviation ΔI _N (I _N2- I _N1 )
Is generated.

Since the AC current cannot be detected by the microcomputer 19, it is necessary to convert the nozzle motor current _IN into a DC component.

FIG. 6 shows an amplifier circuit configuration, and FIG. 7 shows an output example of the amplifier.

FIG. 6A shows, as an example of the amplifier 28, an amplification element 3
2, a rectifier circuit 31, and a peak hold circuit 33. Its operation, when current flows I _N the nozzle motor 26, a voltage waveform appearing corresponding to the current I _N at both ends of the resistor R ₂ connected to the current detector 27. This voltage waveform is amplified by the amplifying element 32, and the rectifier circuit 31 and the peak hold circuit 33 are amplified.
The peak value of the nozzle motor current is converted into a direct current component via and is input to the microcomputer 19. The output of the peak hold circuit 33, as shown in FIG. 7, the DC voltage V _DP corresponding to the peak value of the current I _N.

FIG. 6B shows another embodiment of the amplifier 28 in which a full-wave amplifier circuit is composed of two operational amplifiers, and the output V _DP thereof is the same as that of FIG. _6A .

FIG. 8 shows the detected voltage V _DP corresponding to the change in the load current of the nozzle motor during the suction operation. In the figure, when operating around the suction port 6, the detected voltage V _DP corresponding to the peak value of the load current I _N varies between V _MN and V _MX. V _DP
Is the average value of the detection voltage of V _MN and V _MX .

FIG. 9 shows the result of measuring the change in the average value V _MD of the detected voltage according to the surface to be cleaned. In FIG. 9, the nozzle motor 26 is in full-wave operation (when the nozzle motor 26 is applied with a full-wave rectified voltage of the AC power supply 29 and is operated at full power), and the fan motor FM is in weak operation,
When the nozzle motor 26 is full-wave operation and the fan motor FM is strong operation, is the nozzle motor 26 half-wave operation (nozzle motor 26
When the AC motor 29 applies half-wave rectified voltage to the 26 and operates at half power), the fan motor FM is in weak operation, and the nozzle motor 26 is in half-wave operation and the fan motor FM is in strong operation. Show.

In the figure, in the case of no load corresponding to the state where the suction port 6 is lifted, the rotary brush 10 is in a rotating state, so the average value V _MD of the detected voltage is small and the fan motor F
Regardless of whether M is strong or weak, half-wave operation of the nozzle motor 26 is larger than full-wave operation of the nozzle motor 26. The reason for this is that the current I _N of the nozzle motor 26 is
On the relationship between the detects the peak value, the rotational speed is low (small motor counter electromotive force) is the load current I _N at the time of the half-wave operation flow increases.

On the other hand, during cleaning with the suction port 6 in contact with the surface to be cleaned 1, regardless of the operating states of the nozzle motor 26 and the fan motor FM, the surface of the surface to be cleaned 1 is loosened, folded,
The average value V _{MD of the} detection voltage increases with the increase in the number of times. It should be noted that the folding order indicates the case where the mouthpiece 6 is operated in parallel with the arrangement direction of the rush, and the folding side stitch indicates the case where the mouthpiece 6 is operated orthogonally to the direction of the rush. The numbers ~ represent the length of the hair, and grow according to.

Here, the problem is, when determining the average value V _MD only by connexion cleaning surface of the detection voltage, the nozzle motor 26 and the fan motor FM by connexion average V _MD to the operating state of change, Since the average value V _MD is almost the same in the case of the fold on the folding surface and in the case of jiyutan, the average value V _MD does not change corresponding to the hair length of the jiyutan. It is difficult to determine what the surface to be cleaned 1 is from the level of the average value V _MD of the detected voltage.

The average value V _{MD of the} detected voltage changes depending on the strong or weak operation of the fan motor FM because the water port 6 is in close contact with the surface to be cleaned 1 and the rotary brush 10 load is increased, because the load current I _N of the nozzle motor 26 increases.

FIG. 10 shows the results of measuring the change in the fluctuation range V _MB (V _MX −V _MN ) of the detected voltage according to the surface to be cleaned.

In the figure, the fluctuation range V _MB of the detected voltage is the nozzle motor 26
The fluctuation range V _MB of the detection voltage is zero when there is no load regardless of the operating state of the fan motor FM and the detection voltage of each cleaning surface regardless of whether the folding surface is in the forward or reverse direction. The fluctuation range of V _MB increases in the order of Yuka, Tatami, and Jiyuutan. Furthermore, the difference between Tatami and Jiyutan is differentiated, and it increases according to the hair lengths ac of Jiyutan. ing. Here, the problem is that the cleaning surface 1 is warped only by the fluctuation width V _MB because the fluctuation width V _MB of the detected voltage of the warp and the fold of the cleaning surface 1 is almost the same. , It is difficult to judge whether it is a fold. However, the judgment whether the surface to be cleaned 1 is loose or folded is
This can be determined by taking into consideration the operating states of the nozzle motor 26 and the fan motor FM from the average value V _MD of the detected voltage in FIG.

From the above results, the load current of the nozzle motor 26 during cleaning
The combined use of the average value V _MD and the variation width V _MB of the detection voltage corresponding to I _N, can accurately determine whether the cleaning surface 1 is nothing.

On the other hand, the characteristics of the electric vacuum cleaner are as shown in FIG. In Fig. 11, the horizontal axis represents the air flow rate of the vacuum cleaner Q (m ³ / m
in), the vertical axis shows the suction power P _out showing the suction performance, the motor rotation speed N, and the load current I _D. The area between the two two-dot chain lines is the actual operating range.
When the filter was almost not clogged, the air volume was at the maximum operating point, and as the clogging progressed, the operating point gradually shifted to the left and became completely clogged. When the air volume reaches the minimum operating point. Here, the average value V _{MD of the} detected voltage V _DP depends on the operating state of the vacuum cleaner described above.
Is also related to clogging of vacuum cleaner filters. That is, if the filter is not clogged, the amount of air flow is large and the suction force becomes strong. When the suction force becomes strong, the degree of adhesion between the suction port 6 and the surface to be cleaned 1 becomes large, and the load on the nozzle motor 26 becomes heavy, and the average value V _MD becomes large. On the other hand, if the filter becomes clogged, the amount of air flow will decrease and the suction force will weaken. When the suction force becomes weak,
The degree of adhesion between the suction port 6 and the surface to be cleaned 1 becomes small, the load on the nozzle motor 26 becomes light, and the average value V _MD becomes small.
Therefore, it is necessary to change or correct the standard for determining the surface to be cleaned 1 according to the air volume. Here, as shown in FIG. 11, the load current I _D of the brushless fan motor FM is closely related to the air volume. From this, the load current I _D of the brushless fan motor FM can be detected to determine the degree of clogging of the filter, and the criterion for the surface to be cleaned 1 that depends on the change in the load current I _N of the nozzle motor 26 can be corrected. In addition, the load current I _D must be increased in order to increase the speed of the brushless fan motor FM, which is the strong operation of the vacuum cleaner described above.
Since I _D becomes small, strong / weak operation of the vacuum cleaner can be determined by the load current I _D.

 Next, specific control means will be described.

FIG. 12 shows a control pattern stored in the ROM 19-2 of the microcomputer 19 and is specifically a function table 8 corresponding to each cleaning surface. In this figure, the horizontal axis is the degree of clogging and the vertical axis is the speed command N *, and the rotation speed command is increased in the order of no load, swing, tatami, jiyuutan a, jiyuutan b, jiyuutan c, The rotation speed is set to increase as the clogging further progresses. From this, a speed command is obtained according to the degree of clogging and the surface to be cleaned, and optimum control is achieved.

Next, the processing contents of the microcomputer 19 will be described mainly using FIGS. 1 and 12.

Step 1 ... When the operation switch 30 is turned on, the operation command acquisition process and the start-up process (process 7) are performed to prepare for operation.

Procedure 2 ... Outputs a no-load speed command N ₀ from the function table 8 and performs speed control and current control process (process 9) based on the speed calculation (process 1) and current detection (process 3) results I * is calculated, and based on this current command I *, the transistor to be fired among the transistors TR ₁ to TR _{6 and} the conduction ratio are processed by the firing signal generation process (process 10), and the brushless fan motor is operated. Start up to speed N ₀ . Hereinafter, this series of processing is abbreviated as motor control processing.

Procedure 3 ... The nozzle motor first selects the operation mode of weak rotation (process 8), performs the ignition signal generation process (process 9) to rotate the nozzle motor weakly, and starts up to the rotation speed required for surface determination.

Step 4 ... The current detection process (process 2) of the nozzle motor is performed, and the average value of the load current within a certain sampling time
The surface to be cleaned is estimated by performing the judgment result (process 4) of the surface to be cleaned from the V _MD fluctuation range M _MB (V _MX −V _MN ).

Step 5 ... Based on the estimation result of the surface to be cleaned, the speed commands N _{1 to} N ₅ according to each cleaning surface are selected and the motor control process is performed.

Step 6 ... Detects the load current _ID of the brushless fan motor FM operating at a rotation speed suitable for each surface to be cleaned by the current detection process (process 3), and determines the degree of clogging of the filter based on the detected value. A process (process 5) is performed, and the rotation speed command of the brushless fan motor is corrected according to the degree of clogging.

Step 7 ... Further, the cleaning surface determination processing (processing 4) is performed again in consideration of the degree of clogging of the filter, and the speed commands N _{1 to} N ₅ are selected based on the estimation result of the cleaning surface. If the cleaning surface is loose or fold, the operation mode of the nozzle motor 26 is weak rotation mode (process 8), and if the cleaning surface is loose, the operation mode of the nozzle motor 26 is strong rotation mode (process 8).
Set to.

As a result, the surface to be cleaned 1 is applied to the load current of the nozzle motor 26.
Judgment (estimation) is made from the change in I _N , and the operating speeds of the nozzle motor 26 and brushless fan motor FM are set based on the results, and the clogging degree of the filter is also taken into consideration. As shown in the characteristics of the vacuum cleaner, an electric vacuum cleaner that is optimally controlled according to each cleaning surface can be obtained.

FIG. 14 shows changes in the load current during the suction operation when the nozzle motor is rotated at a low speed. In the figure, when the nozzle motor is rotated at a low speed, the average value and the fluctuation range of the load current on each surface to be cleaned become almost the same. However, since there is a significant difference between no load (corresponding to the suction mouth lifted state) and the suction mouth operation, the nozzle motor 26 is rotated at a low speed while the suction mouth 6 is being lifted, and the nozzle when the suction mouth 6 contacts the surface to be cleaned. It suffices to set the operating state of the motor to a state where the surface to be cleaned can be determined.

Since the type of the surface to be cleaned is estimated from the average value of the peak value of the current of the nozzle motor 26 and the fluctuation range, it is necessary to rotate the rotary brush even with a wooden bowl. Therefore, when the rotary brush is rotated at a high speed, there is a problem of damaging the flank. Therefore, when the rotational speed of the rotary brush that does not damage the raised surface is obtained by experiments,
It was confirmed that it should be 1300 rpm or less. That is,
Considering the reduction ratio between the rotary brush and the nozzle motor, the nozzle motor rotation speed may be set to about 3300 rpm or less. At this time, as a matter of course, the noise around the mouthpiece becomes small.

Further, in the embodiment of the present invention, the peak value after full-wave rectification is used as the nozzle motor current, but the peak value after half-wave rectification may be used.

According to the present invention, the rotation speed of the fan motor (and the nozzle motor) is controlled by determining the type of the surface to be cleaned from the average value of the current values flowing in the nozzle motor and the fluctuation range of the current values. Therefore, the optimum suction force according to the surface to be cleaned can be obtained.

Further, according to the present invention, the degree of clogging of the dust collecting filter is judged from the value of the current flowing through the fan motor to correct the rotation speed of the fan motor (and the nozzle motor), so It is possible to obtain the optimum suction force according to the surface to be cleaned, regardless of the degree of clogging.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a control circuit of a brushless fan motor for an electric vacuum cleaner showing an embodiment of the present invention, FIG. 2 is its control circuit, FIG. 3 is an overall configuration diagram of a vacuum cleaner, and FIG. Fig. 4 is an internal structure diagram of the mouthpiece, Fig. 5 is a waveform diagram of voltage and current applied to the nozzle motor, and Fig. 6 (a) and (b).
Is the output signal amplification circuit of the current detector for the nozzle motor,
FIG. 8 is a diagram showing an output of the amplifier, FIG. 8 is a diagram showing changes in the load current of the nozzle motor when the suction member is operated, and FIG. 9 is a diagram showing changes in the average value of the load current of the nozzle motor with respect to the surface to be cleaned. FIG. 10 is a diagram showing changes in the fluctuation range of the load current of the nozzle motor with respect to the surface to be cleaned, FIG. 11 is a characteristic diagram of the electric vacuum cleaner, and FIG. 12 is a diagram showing a function table according to the surface to be cleaned,
FIG. 13 is a characteristic diagram of the electric vacuum cleaner with respect to the surface to be cleaned, and FIG. 14 is a diagram showing changes in load current during low speed operation of the nozzle motor. 15 …… Base driver, 16 …… Inverter, 17 …… Hall element, 18 …… Magnetic pole position detection circuit, 19 …… Microcomputer, 23, 28 …… Amplifier, 24 …… Firing circuit, 25 ……
Triac, 26 …… Nozzle motor, 27 …… Current detector, 30 …… Operating switch.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takeshi Abe 4026 Kuji Town, Hitachi City, Hitachi, Ibaraki Prefecture Hitachi Research Laboratory, Hitachi Ltd. (72) Inoue Tonehiro 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Hitachi Corporation Hitachi Ltd. (72) Inventor Kunio Miyashita 1-1-1 Higashi-Tagacho, Hitachi City, Ibaraki Hitachi Ltd. Taga Factory (72) Inventor Fumio Joraku 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Hitachi Inside the Taga Factory (72) Inventor Hisanori Toshima 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Inside Hitachi Factory Taga Factory (72) Inventor Mitsuhisa Kawamata 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Hitachi, Ltd. Taga factory (72) Inventor Yoshitaro Ishii 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Company Hitachi Ltd. Taga Factory (72) Inventor Hisao Suga 1-1-1 Higashi Taga-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Taga Factory (72) Inventor Atsushi Hosokawa 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture No. Hitachi Co., Ltd. Taga factory

Claims (3)

(57) [Claims] 1. A cleaner body containing a dust collecting filter and a fan motor for generating an intake air flow, a hose connected to the cleaner body, and a suction body connected to the hose via an extension pipe. An electric vacuum cleaner having a rotary cleaning body for scraping up dust on a cleaning surface and a nozzle motor for driving the rotary cleaning body in the suction body, the detection being for detecting a current flowing through the nozzle motor. Means and
A controller for controlling the fan motor based on the detecting means, wherein the controller determines the nozzle from the detection value of the detecting means when the suction body is in contact with the surface to be cleaned and is operated in the front-back direction. A method for controlling an electric vacuum cleaner, wherein an average value of current values flowing through a motor and a fluctuation range of the current values are calculated, and the rotation speed of the fan motor is controlled based on the calculation result. 2. A cleaner body containing a dust collecting filter and a fan motor for generating an intake air flow, a hose connected to the cleaner body, and a suction body connected to the hose via an extension pipe. An electric vacuum cleaner having a rotary cleaning body for scraping up dust on a cleaning surface and a nozzle motor for driving the rotary cleaning body in the suction body, the detection being for detecting a current flowing through the nozzle motor. Means and
A control device for controlling the fan motor and the nozzle motor based on the detection means, wherein the control device detects the detection means when the suction body is in contact with a surface to be cleaned and is operated in the front-back direction. The average value of the current values flowing in the nozzle motor and the fluctuation range of the current values are calculated from the values, and the rotation speeds of the fan motor and the nozzle motor are controlled based on the calculation results. Control method. 3. The dust detection filter according to claim 1, further comprising a second detection unit that detects a current flowing through the fan motor, wherein the control device detects the dust collection filter from a detection value of the second detection unit. A method of controlling an electric vacuum cleaner, comprising: calculating a degree of clogging and correcting the rotation speed of the fan motor based on the calculation result.